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Laboratory Soft X-R...
Laboratory Soft X-Ray Cryo Tomography
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- Bertilson, Michael (author)
- KTH,Biomedicinsk fysik och röntgenfysik
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- von Hofsten, Olov (author)
- KTH,Biomedicinsk fysik och röntgenfysik
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Vogt, Ulrich (author)
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- Holmberg, Anders (author)
- KTH,Biomedicinsk fysik och röntgenfysik
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- Christakou, Athanasia (author)
- KTH,Biomedicinsk fysik och röntgenfysik
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Jerlström-Hultqvist, J. (author)
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Svärd, S. (author)
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- Hertz, Hans M. (author)
- KTH,Biomedicinsk fysik och röntgenfysik
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(creator_code:org_t)
- English.
- Related links:
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https://urn.kb.se/re...
Abstract
Subject headings
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- X-rays allow quantitative high-spatial-resolution three-dimensional (3D) imaging of intact unstained cells. Such 3D imaging is provided by soft x-ray lens-based methods (water-window cryo tomography) and hard x-ray lens-less methods (coherent diffraction imaging) are emerging. However, both methods rely on high-brightness synchrotron-radiation sources, which limit the accessibility of a wider scientific community. Here we show 3D water-window cryo tomography with a laboratory-source-based microscope arrangement. The system relies on a λ=2.48-nm liquid-jet laser-plasma source, normal- incidence multilayer condenser optics, 30-nm zone-plate optics, and a cryo sample chamber. We demonstrate imaging of intact unstained yeast, protozoan parasites and mammalian cells. 3D images show noise-limited features close to ~100 nm and intra-cellular structure is classified based on the local absorption coefficient. A comprehensive theoretical model of the tomographic imaging system allows optimization of system parameters and a quantitative estimate of the 3D imaging accuracy. The model includes issues such as non-geometric projections of the thick samples and stray light, and is applicable to laboratory as well as synchrotron-based x-ray microscopes. The model shows that laboratory x-ray cryo tomography will allow quantitative 3D imaging with ~30-nm (half-period) resolution over a full 5 µm object.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Physics
- Fysik
Publication and Content Type
- vet (subject category)
- ovr (subject category)
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